Transverse Shifts in Paraxial Spinoptics
C. Duval, P. A. Horvathy, P. M. Zhang

TL;DR
This paper explores how the paraxial approximation of spinning photons leads to exotic transverse shifts and modifications in lens laws, especially at curved interfaces, revealing new momentum shifts.
Contribution
It introduces a novel analysis of transverse shifts and lens laws for spinning photons at curved interfaces, expanding understanding of spinoptics.
Findings
Position shifts are modified at curved interfaces.
A new momentum shift appears in the transverse plane.
Laws of thin lenses are adjusted for spinning photons.
Abstract
The paraxial approximation of a classical spinning photon is shown to yield an "exotic particle" in the plane transverse to the propagation. The previously proposed and observed position shift between media with different refractive indices is modified when the interface is curved, and there also appears a novel, momentum [direction] shift. The laws of thin lenses are modified accordingly.
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